Abstract

The research of deformation of samples made from high-speed steel R6M5 and treated by volumetric pulsed laser hardening (VPLH) under various laser exposure modes and measurement topology (laser radiation energy, distance from the irradiation site) were carried out using strain measurement. It was found that after VPLH treatment of the samples there are deformations in the longitudinal and transverse sections. This fact indicates the volumetric nature of the deformation changes in the material, and at the same time, it shows the pronounced extremum of relative deformations, which depends on the previously listed conditions of exposure and measurement. The results of abrasive wear tests showed the greatest effect of VPLH for the laser irradiation energy of 300 J and the distance from the irradiation site of 24 mm, which corresponds to the results obtained by the strain measurement for the determination of the samples’ relative deformations. The received extremum corresponds to the optimal hardening modes when changing the relative deformation by 1.06 times and increasing of the hardened resistance samples by 2.3 times. The possibility of joint use (convergence) of the tests results for abrasive wear was determined using the method of retrospective (a posteriori) randomization. This allows recommending the strain measurement method for the optimal modes of VPLH determination and can help to significantly reduce the cost of material consumption and labor intensity of laboratory tests, especially in the process of determining the modes for the samples with variable inputs (structure and chemical composition of materials, geometric parameters of products, operating modes, etc.)

中文翻译：

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高速钢R6M5的耐磨性与激光淬火变形的相关性

摘要

利用应变测量对由高速钢 R6M5 制成并经过体积脉冲激光硬化 (VPLH) 处理的样品在不同激光照射模式和测量拓扑（激光辐射能量、距照射部位的距离）下的变形进行了研究。结果发现，经过VPLH处理后，样品的纵向和横向截面均出现变形。这一事实表明了材料变形变化的体积性质，同时，它显示了相对变形的明显极值，这取决于前面列出的暴露和测量条件。磨料磨损试验结果表明，激光照射能量为300 J、距照射部位距离为24 mm时，VPLH效果最大，这对应于通过应变测量获得的结果，以确定样品的相对变形。接收到的极值对应于相对变形改变1.06倍、硬化电阻样本增加2.3倍时的最佳硬化模式。使用回顾性（后验）随机化方法确定联合使用（收敛）磨粒磨损测试结果的可能性。这可以为VPLH测定的最佳模式推荐应变测量方法，并有助于显着降低实验室测试的材料消耗成本和劳动强度，特别是在确定具有可变输入（结构和化学成分）的样品的模式的过程中材料成分、产品几何参数、